ClemensFischer/XAML-Map-Control
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Fixed zoomLevelSwitchDelta value.

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ClemensF 2013-05-16 21:29:43 +02:00
parent 7254a8793a
commit d668ed20ea
1 changed files with 8 additions and 14 deletions
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22
MapControl/TileContainer.cs
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@ -18,8 +18,8 @@ namespace MapControl
{
internal partial class TileContainer
{
private const double maxScaledTileSize = 400d; // scaled tile size 200..400 units
private static double zoomLevelSwitchDelta = Math.Log(maxScaledTileSize / TileSource.TileSize, 2d);
// relative scaled tile size ranges from 0.75 to 1.5 (192 to 384 pixels)
private static double zoomLevelSwitchDelta = -Math.Log(0.75, 2d);
internal static TimeSpan UpdateInterval = TimeSpan.FromSeconds(0.5);
@ -127,9 +127,8 @@ namespace MapControl
{
updateTimer.Stop();
var zoom = (int)Math.Floor(zoomLevel + 1d - zoomLevelSwitchDelta);
var numTiles = 1 << zoom;
var transform = GetTileIndexMatrix(numTiles);
var zoom = (int)Math.Floor(zoomLevel + zoomLevelSwitchDelta);
var transform = GetTileIndexMatrix(1 << zoom);
// tile indices of visible rectangle
var p1 = transform.Transform(new Point(0d, 0d));
@ -137,16 +136,11 @@ namespace MapControl
var p3 = transform.Transform(new Point(0d, viewportSize.Height));
var p4 = transform.Transform(new Point(viewportSize.Width, viewportSize.Height));
var left = Math.Min(p1.X, Math.Min(p2.X, Math.Min(p3.X, p4.X)));
var right = Math.Max(p1.X, Math.Max(p2.X, Math.Max(p3.X, p4.X)));
var top = Math.Min(p1.Y, Math.Min(p2.Y, Math.Min(p3.Y, p4.Y)));
var bottom = Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y)));
// index ranges of visible tiles
var x1 = (int)Math.Floor(left);
var x2 = (int)Math.Floor(right);
var y1 = Math.Max((int)Math.Floor(top), 0);
var y2 = Math.Min((int)Math.Floor(bottom), numTiles - 1);
var x1 = (int)Math.Floor(Math.Min(p1.X, Math.Min(p2.X, Math.Min(p3.X, p4.X))));
var y1 = (int)Math.Floor(Math.Min(p1.Y, Math.Min(p2.Y, Math.Min(p3.Y, p4.Y))));
var x2 = (int)Math.Floor(Math.Max(p1.X, Math.Max(p2.X, Math.Max(p3.X, p4.X))));
var y2 = (int)Math.Floor(Math.Max(p1.Y, Math.Max(p2.Y, Math.Max(p3.Y, p4.Y))));
var grid = new Int32Rect(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
if (tileZoomLevel != zoom || tileGrid != grid)